Skiving-machine.



R. S. POWER.

SKIVING MACHINE. APPLICATION FILED MAY 21. m5.

1 1 62,395. Patented Nov. 30, 1915.

INvENrUV:

5.0 I 11 15. h fi chuset t's, have invented dnction ofa new and holds it inpbsitio'n be skived at the sides ofthe ready been formed, as

SKIVING-MACHIN E.

meshes.

Specification of Lettersilatent. Patentgdfflgv g-fi 1915 Apnlication nes 21, 915. SeIiaI Ne. zeg ess.

To (ZZZ whomit may concern:

leather to b'e fed tea rotary knife'of (ither cutting meohanisin' id'siich a nian'nerthit the piopei" s'cai f is Inadeontheleatheriff "lieretofore great diflicnlty msjbeen eX- perienced in obtaining ng'scaif of even'width and tliicknes's'owing to the inability' of the Presser foot to hold the leather firmly in positionnndei all conditions. Thepressers foot now in commercial usefis provided with a ifigidhead of metalwhi'ch is integi al with a yielding inen ben 'pon \ifhich" it is mounted. The rigid pre'ssef headjbears against leathe j "to be skived end when fed to the cutter. If the leather is smooth and of uniform that portion ofthe thickness transversely of the scarf to' be cuttheibi'esser foot as now" consti'ncted' dosits ork relatively satisfactorily; but if a lump in the leathe b is encountered the pr sserfjfoet is lifted and that portion of the leather toof the pressure and'c'onsequently tends j'to spring up; NVh'en the leather has spru g ups-Wider and deeper scarf is inadef at'this point ivhich' often results'in nickingtlie edge of the blank.

It is also frequently desirable to skive again a, blank np'onlwhich a' scaffh'asje lfor instance when the operator has notset the pressei" foot't'o pf'oduce the desired thickness ofedge. Heietofore it has not been possible tddo this and it has been customary tQthlOW away a blank the edge of which is not thin enoughbecause if an attempt isinade to skive it again to 'reduce its edge to proper thickness it will be nicked and frenderejd useless. This has resulted in a-oo'nsider'able loss of stocln -The machine embodying invention lump is relieved makes it"possible to skive again a piece '\Yliif0h has? already beenkkiveid bfing'ing'fthe edge to p one? thickiie ss- 5nd making per? fectlj good smooth scarf Fufthei nioie it is often'iiecessai yid 'iin a skiveabiflofss one previously Iiiade where there is 5' sh'zii 'p "the blank. i

The device embodying 'my invention is simple inexpensive' to iwodiiceafidis :capablefof being? applied to Skiiring chinesof'vai ions kinds already in use. In the a'ceoinp anying" drawings I have shownfmyfdevioe as applied to a'fskiv'in'g machine "of tl1e"1disk knife type, commonly knoivn' asan'Aina'z'een machine, but it will be nndei'stoodi'tliatl dof not liinit myself by 7 so doing j sin e the device naybe used with equal siic'eess iththe m eh'inesi f the cyl'iildijical knifetybe. I 5

invention will be fully understood from the following de seribtion when taken .1: 5 2. .1 i in connection \Ylbl'l the accompanying drawings aiid" the novel j features" thereof will be fpointed out and clearly defined in" the claims "at the close off the sidecific'atio'n.

"' In tlieihd vinigs Fignfefl' is a front elevation of theifeeding and "cutting mechanism H I myi'n- VQIltlOIL F Q. 2 1s a lan-mew of "a" gage of a, skiving machine, the same ybein' prov ded'with'e pre'ss'ei" foot emb c ying provided with a dev ie' embodying; my invention shown in position "over? affeed toll.

Fig. '3 is anendvieiv of the ii'ar'ts shovvn in Elg. 151g; e is a sectionofa portion of an already skived p'ieiceo fleather showing the PIBSSGI' m mber in'cifoss section; :Figj5 is a blanwiew-of a'poi tion ofa QQQQPLO- vided with a 'inodified'jfofin of pressei' mem- Ha ving reference to the drawings and particularly to of a isl'ziv'ing machine of the type now c'o'fnm'only in con'nn'ercial se This consists of'a feed roll 11 which isnionnted on when-12 jonrnaled in the 'bracke't'13 W'vhichis secured'to th'efran e'oi the; machine not shoi'vn; The feed roll ll has'af edin'g sii rfa'oe 14 which is beveled' as shown'ziiid'a suffece l5'which is sepaifatejd ffon'i the ;Eeed- Fig! 1 there is shown the feeding ing surface 1 1 by a shoulder-16 adapted to cooperate with the edge of a suitable feed disk 17. The feed disk 17,is provided with a hub 18 and is mounted on a shaft 19 which is journaled in a supporting member 20 and is rotated by a belt actuated pulley 21 secured at its upper end. The shaft 12 is in against the feed roll and in the like manner adapted to be rotated by an suitable mechanism not shown, both shafts being arranged so that the edge of the feed disk 17 moves in the same direction and at the same rate with the shoulder 16 of the feed roll 11. A suitable cutter 22, which is preferably ofrthe disk type as shown, but maybe of any otherwell known form is mounted closely adjacent the feed roll and feed disk on a shaft 23 which is journaled in the supporting, member 24; and is provided with a belt actuated pulley 25. The presser foot, which holds the leather 26 yieldingly proper pos1- tion while being fed to the cutter 22 by the feed roll and feed disk, is mounted on a gage 27 secured to a supporting member 28 fast on the frame of the machine. The gage is provided with the usual gage member '60 which is curved to fit the periphery of the feed roll 11 and with a slot 29 which is adapted to receive the shank of a machine screw 30 with which the supporting member 28 is provided thereby enabling the gage to be adjusted longitudinally of the axis of the feed roll. in a manner well known to those skilled in the art. On the upper side of the gage 27 a fiat spring metal member 31 is secured by means of a screw 32 at one end of the member. 31. A slightly elongated slot 33 in the'member 31 is adapted to receive a pin 34 with which the gage 27 is provided which enables the member 31 to j be sprung upwardly butprevents it from being moved about the screw 32 as a pivot. A thumb screw.35 passes through the member 31 and contacts with the gage 27. By this construction it will be seen that the spring member 31 maybe adjusted with relation to the feed roll 11. a

The free end of the bar 31 is provided with a rib 36 which projects out overthe feed roll. is located. It consists of a thin piece of tempered steel 38 which is conveniently se cured to the rib 36 by being bent around as shown in Fig. 3' and held in position by screws 39. The front part 10 of the member 38is sufiiciently thinso that it is capable of springing readily under pressure and in my preferred form consistsof a plurality of blades or fingers 41 which are separated by slots all as shown in Fig. 2. The, blades .41 which are of thin metal as stated are held down against the leather 26 with a firm pressure by the spring member or bar '31. Where there is a lump or an unevenness in the leather the blade or blades which come On the rib 36 the presser member 37 3 directly in contact with said unevenness yield against the pressure of the member 31 allowing the uneven spot to pass without lifting the other blades from out of contact with the leather.

It will be understood of course that the pressure on apart of the blades such for instance as is produced by a bunch in the leather or by a piece which has already been skived is suflicient to overcome the resistance of such of the blades as are in contact with the bunch or ridge in the leather, but is not suflicient to overcome the resistance of spring member 31; on the contrary the united resistance exerted by all of the blades will be suflicient to overcome the resistance of the spring member 31 and lift it up. The result is that part of the blades will rise to permit the passage of the hump or thick spot while the remainder of the blades continue to exert a uniform pressure on the remainder of the leather as it passes through the machine.

At 61 in Fig. 2 is shown a curved backing member which is preferably formed integral with the rib 36 against which the inner blades rest. It will be seen that the effective length of the blades is thereby progressively reduced toward the edge of the piece of leather to be skived, that is, toward the right as seen in Fig. 2', and that consequently a greater pressure will be required to cause the inner blade to move than the one next to it, the resistance of these spring blades.

being substantially inversely proportional to their efiective length. This offers the greatest resistance along the edge of the piece'which is the point at which it is most desirable to have the work held firmly in position.

In Fig. 4: I have shown the position of the blades tl on the leather when a portion of the leather upon which the presser member rests has been previously skived. It will be noted from this figure that the upper surface of the scarf 50 is at an angle to the lower surface. The pressure surface of the .presser member is necessarily set parallel with the feeding surface of the feed roll 11 as is clearly shown in Fig. 1, and therefore is at an angle to the upper surface of the scarf. It will be seen from this figure that the blades not only yield upwardly individually but also twist slightly, their tendency being to lie fiat against whatever surface they are in contact with regardless of its angle 0 inclination.

In Fig. 5 there is shown a modified form of 'presser member which consists of a thin springmetal'blade 53 which is secured to themembcr 31 in the same manner as the presser member described above. The blade is' not divided into smaller blades as the preferred form of presser member but nevertheless is sufliciently thin to yield irregularly to take care of the hard spots, skived portions, etc., in the leather. While the other form of presser member is to, be preferred, in many instances, ber is entirely satisfactory. My device has the further advantage that the operator may more readily guide the leather through the feeding mechanism to the knife. In all presser feet heretofore constructed so far as known to me, it is impossible for the operator to see the chip which is cut by the knife until one-quarter of an inch or more of it has been cut. The presser foot is necessarily located in a position Where it is under other parts of the skiving machine. The operator therefore cannot look directly down upon the presser foot but must look at it from an angle in front of the machine. In the solid presser members employed the edge of the knife at thetime of the cutting is concealed from the front of the machine owing to the thickness of the presser member Which completely covers up the point of cut and also prevents a portion of the chip from being seen. The operator must guide the leather by the thickness of the chip and Where he cannot see the chip as it is cut the mistake in the guiding may produce a perceptible error in the skiving before he is aware of the fact and can correct the mistake. The device embodying my invention is so arranged that the operator can see the chip at the cutting point Without getting his head into the machine and can rectify mistakes in the guiding as soon as they are made so that no perceptible variation in the skiving will result.

What I claim is:

1. In a leather skiving machine the combination of a rotary knife, a feed Wheel having a beveled feeding surface adapted to cooperate with said knife, a supporting member adjacent said feed Wheel and rotary knife, and a presser member secured to said supporting member, said presser member comprising a thin spring metal blade having an effective surface substantially parallel with the bevel on said feed Wheel.

2. The improved presser foot for skiving machines comprising a yielding supporting member, and a presser member secured to said supporting member, said presser member having a thin spring metal blade.

3. In a leather skiving machine the combination of a rotary knife, a feed Wheel having a beveled feeding surface adapted to cooperate With said knife, a supporting member adjacent said feed Wheel and rotary knife, and a presser member secured to said supporting member having an effective surface composed of a series of thin spring metal blades.

4. The improved presser foot for skiving machines, comprising a yielding supporting member, and a presser member secured t0 1 find this memsaid supporting member, said pressermember having an effective surface composed of a series of thin spring metal blades.

5. A presser foot for skiving machines comprising a supporting member, and a presser member secured to said supporting member consisting of a curved sheet of spring metal, a portion of said sheet of spring metal having slots therein to form a plurality of spring blades.

6. In a leather skiving machine the combination with a leather feeding member and a knife, of a presser foot, said presser foot consisting of a yielding supporting member and a presser member, said presser member having an effective surface which is under an elastic pressure independently of said yielding supporting member and adapted to hold leather against the said feeding member in advance of'the knife,

7. In a leather skiving machine the combination With a leather feeding member and a knife, of a presser foot, said presser foot consisting of a yielding supporting member and a presser member, said presser member having an effective surface capable of yielding throughout independently of said supporting member and adapted to hold leather against the said feeding member in advance of the knife.

8. The improved presser foot for skiving machines comprising a supporting member, a presser member secured to said supporting member, said presser member comprising a thin spring metal blade, and a reinforcing member adjacent to and overlying a portion only of the upper surface of said thin metal blade, whereby the pressure exerted by said portion of the spring metal blade is greater than that exerted by the remaining portlon 1 of said blade.

9. The improved presser foot comprising 7 a yielding support, a rib on said support pro ect1ng from oneend thereof, and a presser member detachably secured to said 121 rib, said presser member being curved around said rib and having an effective portion adapted to contact With leather, said effective portion consisting of a plurality of spring metal blades.

10. The improved presser foot for skiving machines comprising a supporting member, a presser member secured to said supporting member, said presser member having a thin spring metal blade, and a reinforcing member in contact With the upper surface of said thin metal blade for an area which is greater near the supporting member Whereby the pressure exerted by the portion of the spring blade near the supporting member is greater than that exerted by the portion thereof which is farther avvay from said supporting member.

11. The improved presser foot for skiving machines consisting of a yielding supporting member, and a presser member secured to said supporting member having a yielding pressure surface, the elasticity of said yielding supporting member and of said yielding pressure surface being so proportioned that when greater pressure is exerted over one portion of the area of said pressure surface than over the remaining portion, said portion will yield before said supporting member yields, and when pressure is exerted over substantially the entire area of said pressure surface said supporting member Will yield substantially at the same time with said presser member.

. 12. In a leather skiving machine the combination of a rotary knife, a feed Wheel adjacent the said rotary knife and adapted to cooperate therewith, a supporting member adjacent said feed Wheel and rotary knife, and a presser member secured to said supporting member comprising a thin metal blade, said thin metal blade being secured to said supporting member at a point nearer to the operator than the edge of said metal blade whereby the operator has an unobstructed vision of the edge of the blade.

13. In a leather skiving machine the combination of a rotary knife, a feed Wheel hav ing a feeding surface adjacent the said r0- tary knife and adapted to cooperate therewith, a supporting member adjacent said feed Wheel and rotary knife, and a presser member secured to said supporting member, said presser member comprising a thin spring metal blade having an effective surface substaniially parallel With the feeding surface of said feed Wheel.

In testimony whereof I affix my signature.

RALPH S. POWER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

